检索结果-南通市图书馆

Conflict-Aware Safe Reinforcement Learning:A Meta-Cognitive Learning Framework

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2022年第3期9卷 466-481页

作者： Majid Mazouchi subramanya Nageshrao Hamidreza Modares Michigan State University East LansingMI 48824 USA Ford Research and Innovation Center Ford Motor CompanyPalo AltoCA 94304 USA IEEE

In this paper,a data-driven conflict-aware safe reinforcement learning(CAS-RL)algorithm is presented for control of autonomous *** safe RL results with predefined performance functions and safe sets can only provide safety and performance guarantees for a single environment or *** contrast,the presented CAS-RL algorithm provides safety and performance guarantees across a variety of circumstances that the system might *** is achieved by utilizing a bilevel learning control architecture:A higher metacognitive layer leverages a data-driven receding-horizon attentional controller(RHAC)to adapt relative attention to different system’s safety and performance requirements,and,a lower-layer RL controller designs control actuation signals for the *** presented RHAC makes its meta decisions based on the reaction curve of the lower-layer RL controller using a metamodel or *** specifically,it leverages a prediction meta-model(PMM)which spans the space of all future meta trajectories using a given finite number of past meta *** will adapt the system’s aspiration towards performance metrics(e.g.,performance weights)as well as safety boundaries to resolve conflicts that arise as mission scenarios *** will guarantee safety and feasibility(i.e.,performance boundness)of the lower-layer RL-based control *** is shown that the interplay between the RHAC and the lower-layer RL controller is a bilevel optimization problem for which the leader(RHAC)operates at a lower rate than the follower(RL-based controller)and its solution guarantees feasibility and safety of the control *** effectiveness of the proposed framework is verified through a simulation example.

关键词： Optimal control receding-horizon attentionalcontroller(RHAC) reinforcement learning(RL)

Groundwater Potential Zoning in Thirumanimuttar Sub-Basin Tamilnadu, India—A GIS and Remote Sensing Approach

在线全文

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2011年第1期14卷 17-26页

作者： MURUGESAN Vasanthavigar KRISHNARAJ Srinivasamoorthy KANNUSAMY Vijayaragavan SELVARAJ Gopinath subramanya Sarma Department of Earth Sciences Annamalai UniversityAnnamalai Nagar-608 002Tamil NaduIndia National Geophysical Research Institute(NGRI) Uppal RoadHyderabad-500 007India

The main objective of the study is to identify groundwater potential zones in Thirumanimuttar basin with an integrated approach using Remote Sensing and geographical information system(GIS).FCC Image of Landsat TM 30 m resolution data and topographic maps has been used to generate thematic maps like geology,geomorphology,lineament and lineament density,drain-age,drainage density,and slope map of the study area.A number of geomorphic units such as Denudational hills,structural hills,Bajadas,Colluvial plain,Pediplain,Deep Pediment and Alluvial plains have been observed.A composite groundwater potential map has been generated as very high,high,medium,low and very low based on the groundwater availability *** upper,mid-dle and downstream of the basins have been identified as potential zones for groundwater *** regions of lineaments and intersecting lineaments proved for groundwater potential *** data generated was validated with field checks and ob-served to be in conformity with the same.

关键词： geomorphology groundwater Landsat potential zones remote sensing GIS

Preliminary study on modelling, fabrication by photo-chemical etching and in vivo testing of biodegradable magnesium AZ31 stents

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2021年第6期6卷 1663-1675页

作者： Bala subramanya Pavan Kumar Kandala Guangqi Zhang Capucine LCorriveau Mark Paquin Madeleine Chagnon Dana Begun Vesselin Shanov Department of Mechanical and Materials Engineering University of CincinnatiOH45221USA Department of Chemical and Environmental Engineering University of CincinnatiOH45221USA Charles River Laboratories Montreal ULC BoisbriandQuebecJ7H 1N8Canada Medical Products Market Consulting IncIndianapolisIN46202USA Waygate Technologies Baker HughesCincinnatiOH45241USA

Magnesium metal(Mg)is a promising material for stent applications due to its biocompatibility and ability to be resorbed by the *** of stents by laser cutting has become an industry *** alternative approach uses photo-chemical etching to transfer a pattern of the stent onto a Mg *** this study,we present three stages of creating and validating a stent prototype,which includes design and simulation using finite element analysis(FEA),followed by fabrication based on AZ31 alloy and,finally,in vivo testing in peripheral arteries of domestic *** to the preliminary character of this study,only six stents were implanted in two domestic farm pigs weighing 25-28 kg and they were evaluated after 28 days,with an interim follow-up on day *** left and right superficial femoral,the left iliac,and the right renal artery were selected for this *** diameters of the stented artery segments were evaluated at the time of implantation,on day 14 and then,finally,on day 28,by quantitative vessel analysis(QVA)using fluoroscopic *** Coherence Tomography(OCT)imaging displayed some malposition,breaks,stacking,and protrusion into the lumen at the proximal,distal,and mid-sections of the stented *** stents degraded with time,but simultaneously became embedded in the *** 28 days,the animals were euthanized,and explanted vessels were fixed for micro-CT imaging and histology ***-CT imaging revealed stent morphological and volumetric changes due to the in-body *** in vivo corrosion rate of 0.75 mm/year was obtained by the CT *** histology suggested no-life threatening effects,although moderate injury,inflammation,and endothelialization scores were observed.

关键词： Magnesium alloy FEA modelling Stents Photo-chemically etching Micro-CT Histology

Attribute driven inverse materials design using deep learning Bayesian framework

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2019年第1期5卷 22-35页

作者： Piyush M.Tagade Shashishekar P.Adiga Shanthi Pandian Min Sik Park Krishnan S.Hariharan subramanya Mayya Kolake Next Gen Research Samsung Advanced Institute of TechnologySamsung R&D InstituteBangalore 560037India Autonomous Material Development Lab Samsung Electronics130 Samsung-roSuwonGyeonggi-do 443-803Republic of Korea

Much of computational materials science has focused on fast and accurate forward predictions of materials properties,for example,given a molecular structure predict its electronic *** is achieved with first principles calculations and more recently through machine learning approaches,since the former is computation-intensive and not practical for high-throughput *** for the right material for any given application,though follows an inverse path—the desired properties are given and the task is to find the right *** we present a deep learning inverse prediction framework,Structure Learning for Attributedriven Materials Design Using Novel Conditional Sampling(SLAMDUNCS),for efficient and accurate prediction of molecules exhibiting target *** apply this framework to the computational design of organic molecules for three applications,organic semiconductors for thin-film transistors,small organic acceptors for solar cells and electrolyte additives with high redox *** method is general enough to be extended to inorganic compounds and represents an important step in deep learning based completely automated materials discovery.

关键词： inverse learning enough

Microstructure and mechanical properties of rutile-reinforced AA6061 matrix composites produced via stir casting process

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2019年第11期29卷 2229-2236页

作者： subramanya R.PRABHU Arun K.SHETTIGAR Mervin A.HERBERT Shrikantha S.RAO Department of Mechanical Engineering National Institute of Technology KarnatakaSurathkalIndia Department of Mechatronics Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipalIndia

A novel process of fabricating aluminium matrix composites(AMCs)with requisite properties by dispersing rutile particles in the aluminum matrix was studied.A novel bi-stage stir casting method was employed to prepare composites,by varying the mass fractions of the rutile particles as 1%,2%,3%and 4%in AA6061 *** density,tensile strength,hardness and microstructures of composites were ***-stage stir casting method engendered AMCs with uniform distribution of the reinforced rutile particles in the AA6061 *** was confirmed by the enhancement of the properties of AMCs over the parent base ***-reinforced AMCs exhibited higher tensile strength and hardness as compared with unreinforced parent *** properties of the composites were enhanced with the increase in the mass fraction of the rutile ***,beyond 3 wt.%of rutile particles,the tensile strength *** hardness and tensile strength of the AMCs reinforced with 3 wt.%of rutile were improved by 36%and 14%respectively in comparison with those of matrix alone.

关键词： AA6061-rutile composite bi-stage stir casting microstructure mechanical properties fractography

Tissue Engineered Osteogenesis in Bone Defects by Homologous Osteoblasts Loaded on Sterile Bioresorbable Coral Scaffold in Rabbits

在线全文

学校读者我要写书评

暂无评论

Surgical Science 2011年第7期2卷 369-375页

作者： Arvind Tripathi Pandruvada subramanya Narayana Murthy Govind Keshri Man Mohan Singh 不详

Objectives: This study explores feasibility of tissue-engineered osteogenesis using sterile coral implants loaded with homologous osteoblasts to repair bone defects. Study Design: A unilateral 4 mm transverse dis- continuity defect was produced approximately mid-way along left radius of young female rabbits using ro- tary diamond disc under continuous saline irrigation and stabilised with autoclaved steel miniplate and screws. The defect was then fitted with sterile bioresorbable coral implant loaded with homologous neonatal calvarial osteoblasts or control implants without osteoblasts. All animals underwent radiography immedi- ately post-operative, at weekly intervals for four weeks and at fortnightly intervals thereafter. Operated bones were histologically evaluated for osteogenesis at 12 weeks. Results: Findings demonstrate osteogenesis and complete repair of bioresorbable coral implant by homologous osteoblasts loaded on coral scaffold. Conclu- sions: Single stage surgery using this technique to induce osteogenesis and closure of discontinuity bone de- fects including palatal clefts and peripheral reduction of large craniofacial defects might prove better thera- peutic modality than autologous bone grafting or tissue distraction osteogenesis.

关键词： Osteogenesis Homologous Neonatal Calvarial Osteoblasts Bioresorbable Coral Scaffold Discontinuity Bone Defects Rabbit

家蚕Mysore纯种(Bombyx mori L.)与幼虫期较短的突变种之间的遗传上的区别

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

广东蚕业 1984年第1期 69-70页

作者： G. SREERAMA REDDY G. subramanya 陈作傅 Manasagangotri 买梳大学动物学研究生学习与科研系 Manasagangotri 买梳大学动物学研究生学习与科研系华南农学院印度买梳(Mysore) 57006 印度买梳(Mysore) 57006

分析家蚕的变种与标准品系的α与β酯酶个体发育的差异性,以决定两者间遗传的差异。标准品系所显示的α与β酯酶具有12和11同工酶带,而变种的酶仅各有8和10环带。在发育历程中,酶带的变异表现显示了不同基因的行为从标准品系与变异品系... 详细信息

分析家蚕的变种与标准品系的α与β酯酶个体发育的差异性,以决定两者间遗传的差异。标准品系所显示的α与β酯酶具有12和11同工酶带,而变种的酶仅各有8和10环带。在发育历程中,酶带的变异表现显示了不同基因的行为从标准品系与变异品系的基因型与表现型的区别上来讨论两者间酶的活性的显著的区别。

关键词：幼虫期突变种生活史 Bombyx mori L Mysore 家蚕桑蚕

Molecular biology techniques for the surgeon

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Surgical Procedures 2012年第2期2卷 5-15页

作者： Gopal Kowdley subramanya Srikantan Kotb Abdelmohsen Myriam Gorospe Javeed Khan Department of Surgery St Agnes Hospital Baltimore MD 21229 United States Laboratory of Molecular Biology and Immunology National Institute on Aging NIH Baltimore MD 21224 United States

New technologies are constantly being introduced into the medical and surgical fields. These technologies come in the form of newer medicines, imaging methods and prognostic tools, among others, and allow clinicians to make more rational and informed decisions on the care of their patients. Many of these technologies utilize advanced techniques which are at the forefront of many research fields and represent a transition of bench advances into the clinical realm. This review will highlight four technologies that are at the forefront in the treatment of oncology patients treated by surgeons on a daily basis. Circulating tumor cells, microarray analysis, proteomic studies and rapid sequencing technologies will be highlighted. These technologies will be reviewed and their potential use in the care o surgical patients will be discussed.

关键词： Methods Molecular diagnostic techniques Medical oncology General surgery MT

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

用于空间飞行封装的刚—挠性板

印制电路信息 2005年第12期13卷 55-59页

作者： A.Suresh M.L.subramanya Sumdaraganesan B.N.Baliga 孔祥麟

概述了刚—挠性多层板的结构,制作方法和应用实例。

关键词：刚—挠多层板封装母板子板子系统